Loom dobby



1931- I c. 0. BROWN 1,804,368

LOOMVDOBBY v 7 Filed Dec. 29, 1927 Fig.1,

lnveni'or. Carl D. Brown Patented May 5, 1931 UNITE-D STAT-Es.

cam. 12.

PATENT oFFicE BROWN, OF HOI E'EDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF'MlAINE LOOM DOBBY Application filed December 29, 1927. Serial No. 243,348.

, This invention relates to adobby mechanism for a loom in which a plurality or ser es of indicatingfingers control the'operations of theharnesses. These fingers which are made 7 a from metal are frequently broken while in use and have to be removed and replaced.

The object of the invention is to provide a simple and efficient means for mounting the indicating fingers so that any finger may be 10 removed and replaced expeditiously and Asthe inventionrelates to a single feature of construction in the loom dobby and is applicable to a wide range of dobby mecha nisms, it will be suilicient here to illustrate one form of dobby mechanism and as to that form only those parts with which theinvention is directly concerned.

In the drawings:

Fig. 1 is a view chiefly in transverse vertical section taken on the line 11 of Fig. 2, but on a larger scale.

tion and similar in shape except at their rear ends. One set of fingers such as 3 have straight rear ends 4 cooperating with vertical lifting rods 5 which control 7 of the dobby (not shown), while the other set of indicating fingers, as 6, have upwardly bent or curved rear ends 7 directly controlling the lower hooks 8 of the dobby. These indicating fingers are shown as operated in the usual manner by risers 9 on a pattern chain running over a sprocket wheel 10 mounted on a shaft 11 extending transversely beneath the l i fingers. Normally the front ends of the indi- Fig. 2 is a side elevation, partially in ver-" the upper hookscating fingers rest on the transverse bar 2.

When a riser of the pattern chain comes beneath an indicating finger, the front en'd'is rocked upwardly, thus depressing the rear end and allowing the corresponding hook to drop'into engagement with one of the reciprocating knives 12 and shift the corresponding harness all in a mannerwell known and familiar to those skilled in the art. In Fig. 2 the dobby finger 3 is shown in normal position resting on the bar 2, while the indicating'finger 6 is shown as raised by a riser 9,

' allowing the hook 8 to drop into engagement with the knife 12 and shift the harness, all in a manner well known and familiar to those skilled in the art. V y

In the preferred construction here illustrated,' the indicating fingers have aligned bearing openings fitting a common transverse fulcrum shaft 13- and beneath the bearing' opening each finger presents'a similar semi-circular depending projection 14. Immediately beneath the aligned projections 14, and slightly separated therefrom, is mounted a transverse supporting bar'15 having in its upper face a groove 16 corresponding in general shape to the projections 14. This bar 15 is secured byscrews 17 to flanges 18 on'the side members 1' of the frame.

The fulcrum shaft 13 is in the form of a rod passed through and supported in aper tures inthe side frame members 1. a At one end this rod is bent laterally at 19 to form a [handle and a positioning stop engaging the side frame member 1. At the opposite end this rod'is taperedto a conical point20and this pointed end is-also splitat' 21.

r The supporting bar 15 performs no function in the normal operation ofthe indicating fingers, which simply rock or fulcrum-on the-shaft or rod '13. When, however, it is des red to remove and replace any finger, the

rod '13 is removed endwise from the frame and the projections 14 of the indicating fingers drop into the groove 16 of the supporting bar This groove prevents any endwise displacement-"of the'indicating fingers and furthermore this bar; when the parts are in normal position, is spaced from the fingers a distance less thanhalf the diameter of the rod or fulcrum shaft 13, so that when the rod is removed and the fingers are resting in the supporting bar, the rod may readily be pushed back into place through the aligned bearing openings of the indicating fingers which are thus so supported as to allow the conical point 20 to pass readily through the openings and back into its bearing in the side frame. Thus any finger may be removed and replaced and the rod 13 reinserted because the indicating fingers when resting on the supporting bar have their aligned bearing openings in position to receive the pointed end of the rod.

The rod may be held in place by slightly separating the parts of the pointed end by inserting a tool in the slot 21.

It will thus be seen that when the fulcrum shaft or rod 13. is in place, the indicating fingers rock on this rod or shaft and are prevented thereby from rising bodily, sothat the movements of the fingers are controlled positively and entirely by the risers on the pattern chain. It will also be seen that when it is desired to remove or replace an indicating finger, the supporting bar holds the fingers in aligned position against endwise movement andwith the bearing openings in position to receive the fulcrum shaft or rod when it is reinserted. Furthermore, this supporting bar in no way interferes with the normal rocking movement of the indicating fingers. f

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is: V V

1. In a loom dobby the combination of a frame, a fulcrum shaft pointed at one end, mounted in fixed bearings in the frame and endwise removable therefrom, a series of indicating fingers having bearing openings fitting said shaft acting to permit the fingers to rock on the shaft but to prevent the fingers rising bodily on the shaft, a supporting bar extending parallel with the shaft beneath the fingers and spaced therefrom a distance less than half the diameter of the shaft whereby,

when the shaft is removed, the fingers will be supported on the bar in position to permit the shaft readily to be reinserted through I the bearing openings and into its bearings and whereby, when the fingers are in position on the shaft, the bar will not interfere with their normal rocking movement and cooperating means on the fingers and on the bar acting when the fingers are supported on the bar to retain the fingers longitudinally in positlon to be threaded by the shaft when it is replaced in its bearings.

2. In a loom dobby the combination of a frame, a fulcrum shaft pointed at one end and mounted in fixed hearings in the frame and endwise removable therefrom, a series of indicating fingers having bearing openings and similar aligned depending projections below said bearing openings, said hearing openings fitting the shaft and acting to permit the fingers to rock on the shaft but to prevent the fingers rising bodily on the shaft, and a supporting bar extending parallel with the shaft beneath the fingers and having a groove in its upper face to receive the aligned projections and spaced therefrom a distance less than one-half the diameter of the shaft, whereby when the shaft is removed, the fingers will be supported in the groove in the bar and retained thereby longitudinally in position to be threaded by the shaft when it is re laced in its bearings and whereby, when the ngers are in position on the shaft, the bar will not interfere with their normal rockin movement.

in testimony whereof, I have signed my name to this specification. 

